Los resultados de una encuesta realizada a 25 mujeres en un supermercado muestran que a un promedio de 7 de ellas les piden la tarjeta de vacuna contra covid-19 para entrar, con una desviacin estndar de 2. Construye un intervalo de confianza de 99% para estimar la varianza de las entradas de mujeres al sper si se supone una distribucin normal.

The results of a survey carried out with 25 women in a supermarket show that an average of 7 of them are asked for their covid-19 vaccine card to enter, with a standard deviation of 2. Construct a 99% confidence interval for estimate the variance of the entries of women to the supermarket if a normal distribution is assumed.